US1632837A - Steel retainer - Google Patents

Description

June 21, 1927 a, c. HANsm STEEL RETAINER Filsd. Aug, '7, 1925 1 13 115 A W EWEY.

Patented June 21, 1927.

CHARLES c. HANSEN, or EASTON, PENNSYLVANIA, AssiGNon TO INeEn soLL-nANn COMPANY, OF JERSEY CITY, NEVT JERSEY, A

CORPORATION OF JERSEY.

STEEL RETAINER.

Application filed August 7, 1926. Serial No. 127,953.

This invention relates to rock drills, but more particularly to a steel retainer for fluid actuated rock drills of the hammer type.

The objects of the invention are to prevent ejection of the drill steel from the drill, to insure against accidental displacement of the retaining yoke, and to simplify the construction of retainers of this type.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements, arrangement of parts, and features of construction substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1 is a sectional elevation of so much of a rock drill as will serve to illustrate the invention,

Figure 2 is a side elevation of the front end of a rockdrill showing the retainer in its retaining position,

Figure 3 is an end view of a rock drill showing the manner in which the yoke cooperates with the collar of the drill steel for preventing ejection of the drill steel from the front head of the drill, and

Figure at is an end view of the retainer bearing.

Referring to the drawings, the invent-ion is shown applied to a rock drill in which only a front head A, a front cylinder washer B and the front end of a Cylinder C are shown.

A drill steel D having a collar E is sup- V orted by the front head A and has a shank l which extends into the path of an anvil block G guided by the front cylinder washer B for transmitting the blows of the hammer piston H to the drill steel D. The parts comprising the casing of the drill, namely the front head A, the front cylinder washer B, and the cylinder C are in this instance held in assembled relationship by sidebolts J which extend through suitable lugs K on the rearward end of the front head A.

In the present instance the side bolts J are of a length to extend well forwardly of the lugs K for the reception of springs L which serve to cushion relative longitudinal movement of the front head A with respect to the cylinder C. t

In drills of the type to which the present invention relates, means are usually provided exterior of the drill for preventing ejection of the drill steel from the drill. Such means are particularly desirable when the drill is being used for drilling thin layers of material such as concrete pavements, or walls in which the drill steel readily penetrates the material and upon the decrease of resistance against the drill bit, the hammer piston tends to force the drill steel out of the front head. In order to at all times insure the retention of the drill steel in the front head, a yoke O is adapted to partly encircle the drill steel D forwardly of the collar E and has rearwardly extending side arms P, the free ends of which are provided with inwardly ex tending lateral hooks Q which cooperate rotatively with apertures R of bearings S. These bearings S are provided with longitudinal apertures T to cooperate slidably with the side bolts J whereon they are mounted, said side bolts J being of sufficient length to enable the bearings S to be arranged between the lugs K of the front head A and thesprings L whereby the said bearings are constantly pressed against the lugs K. In this way the springs Lalso serve as adequate cushioning means for the yoke O In order that the yoke 0 may at all times be held against accidental displacement from its retaining'position, the bearings S are provided with longitudinal grooves U which cooperate with the side arms P for-preventing oscillation of the yoke O. The grooves U extend on both sides of the apertures R thus rendering the bearings S reversible and interchangeable on the side bolts J.

It is to be noted that the free ends of the side arms P are so spaced with respect to each other that when the hooks Q, are inserted in the apertures, it will be necessary to spread the side arms P somewhat. In this way a certain springeifect will be obtained in the side arms and the yoke which will be sufficient at all times to hold the side arms P in engagement with the grooves U.

The foregoing described. retainer permits of several methods ofv assembling the same on the rock drill. A convenient method consists in inserting the hooks Q, in the apertures R of the bearings S and then mounting the hearings on the side bolts J. The side bolts J, together with the retainer and its bearings, may then be attached to the rock drill in the usual manner. If, after the retainer has been. secured to the rock hook in the opposite bearing.

' ever it isdesired to re noye,

from the front head, the yoke may be oscillated about the hooks Q until the side drill, breakage of the yoke should occur, another yoke may be readily substituted therefor by merely inserting one of the hooks in one of thebearings S and then spreading the arms]? for the insertion Oflillfi other During theoperation of the drill, 'wlienarms P arevlrooked out of the grooves Sacha movement of the retainer Will remove the yoke from the path of the collar E of the drill steel D and the drill steel D-maylthen be Withdrawn from the front head andanother steel substituted therefor.

I claim: I

1. In a rock drill, the combination of a cylinder, a front head for the cylinder, a drill steel extending into the front head,- sidebolts for securing the front head to the cylinder, a yoke for preventing ejection of the drill steel from the front head, side arms on the yoke, hooks on the side armsand bearings slidable on the side rods to rotatably receive, the hooks for supporting the side arms in a plane offset from the longitudinal axis of the front head, sa d bearings being, reversible With; respect to the side bolts.

, 2. Inv a rock drill, the combination of a cylinder, afront head for tliecylinder, a drill steel extending into the front head, side bolts forsecnringthe front head to the cylinder,:a yoke for preventing ejection of the drill steel from the front head, side armsioii the; yoke, inwardly extending lateral hooks 0n the side arms, and .bearingslslidable on for supporting the side arms in a plane,

offset from thelongitiidinal axisof the front head, said-bearingshavingegrooycs to cooperate ith the side arms fo yholding the yoke in retaining andreleasing, positions. 1

l In arock drill, tliecoinbiiiation ;of a

the drill steelcylinder, a front head for the cylinder, lateral lugs on the front head, a drill steel eX- tending into the front heed, side rods for securing the front head to the cylinder, springs on the side rods, a yoke partlyencircling the drill steel for retaining said drill steel in the front head, side arms on the yoke, nwardly extending latoi'alhooks on the on the side arms, bearings slid-able side rods between the springs and the lugs, said bearings having transverse apertures to receive-the llOOlS for supporting the side arms in a plane offset from the longitudinal axis of the drill steel, and grooig'erin the sides of the bearings to cooperate with the side arms for holdingthe yoke in retaining and releasing positions.

, 5. Ina rock drill, the combination of a cylinder andfront head, a drill steel extending-into the front head, side bolts securing the front head to the cylinder,bearings on the side bolts, a yoke preventing ejection of the drill steel from the front head, andside arms on the yoke pivoted With their free ends in the bearings, said side arms being held in engagement with the ibearingsiby the resiliencyof the side arms and the yoke. V l

6. In a'rock drill, the combination of a cylinder and fronthead, drill'steel extending into the front head, side boltssecuring the front head to the cylinder, bearings slidable, on the side bolts, said bearings having, longitud nal grooves and transverse apertures, a yoke for retaining-the drill steel inthe front head, sideqaliml on the yoke, and-hooksuonthe, side arms extend erti res, said ing into the a side arms being engaged by tie grooves and held in engagement therewith by the resiliency or, the side armsand the yoke.

7. In a rockydrill, thecombiiiation of a cylinder and front head, sidebolts securing the ,front head to the cylinder, a drill, steel extending into the fronthead, means comprising a yoke with, side arinsfor preventing ejection ofthe drill steel from the front head, bear ngs on the. side bolts pivotally supporting the side arms, and means in the bearings engaging, the side rods to hold the yokel n retaining position, said side arms being heldin engagement with said means by theresiliency of tlieiside arms and theyoke. In testimony whereof I have signed this specification, i

CHARLES c. i-iiiiis ni.

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